private ConditionalTagsTag(ConditionalTagsTag that, string key)
     : base(that, key)
 {
     Tags = that.Tags;
 }
 private ConditionalTagsTag(ConditionalTagsTag that, int?duration)
     : base(that, duration)
 {
     Tags = that.Tags;
 }
 private ConditionalTagsTag(ConditionalTagsTag that)
     : base(that)
 {
     Tags = that.Tags;
 }